Pettibone was best known as a defendant in trial of three leaders of the Western Federation of Miners for the 1905 assassination by bombing of Frank Steunenberg, former governor of Idaho.

Pettibone was convicted of contempt of court and criminal conspiracy in the Coeur d'Alene labor strike of 1892.

He was later implicated in the 1905 assassination of Frank Steunenberg, ex-governor of Idaho,[1] by a confession and testimony from Harry Orchard.

Haywood was represented by Clarence Darrow, the most renowned defense lawyer of the day, who obtained an acquittal.

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